My late father had passed away in 1985 (40 years ago).

Question

My late father had passed away in 1985 (40 years ago). His will was not a shariah compliant will. My brother was running the business. My father had a lot of farm properties, mining properties and businesses in a small farming and mining town. My father‟s heirs were his 4 daughters, 2 sons and wife (my mother). A few months after the death of my father, my two sisters received cash amounts of R20 000.00 (Twenty thousand rand each) from his attorneys as being their shares of the inheritance. So we sisters did not want a confrontation with him (our brother). Therefore, we left the matter. On enquiring of our 2 sisters‟ shares from my youngest brother, we were told that my father had given us in his lifetime a share in a property worth R20.000 each so there was no inheritance for us. Even after 40 years, my father‟s estate has not be sorted out according to the Shariah. My three sisters have already died. What is the Shariah‟s ruling regarding this issue?